1/* 2 * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25package com.sun.beans.decoder; 26 27/** 28 * This class is intended to handle <var> element. 29 * This element retrieves the value of specified variable. 30 * For example:<pre> 31 * <var id="id1" idref="id2"/></pre> 32 * is equivalent to {@code id1 = id2} in Java code. 33 * <p>The following attributes are supported: 34 * <dl> 35 * <dt>idref 36 * <dd>the identifier to refer to the variable 37 * <dt>id 38 * <dd>the identifier of the variable that is intended to store the result 39 * </dl> 40 * 41 * @since 1.7 42 * 43 * @author Sergey A. Malenkov 44 */ 45final class VarElementHandler extends ElementHandler { 46 private ValueObject value; 47 48 /** 49 * Parses attributes of the element. 50 * The following attributes are supported: 51 * <dl> 52 * <dt>idref 53 * <dd>the identifier to refer to the variable 54 * <dt>id 55 * <dd>the identifier of the variable that is intended to store the result 56 * </dl> 57 * 58 * @param name the attribute name 59 * @param value the attribute value 60 */ 61 @Override 62 public void addAttribute(String name, String value) { 63 if (name.equals("idref")) { // NON-NLS: the attribute name 64 this.value = ValueObjectImpl.create(getVariable(value)); 65 } else { 66 super.addAttribute(name, value); 67 } 68 } 69 70 /** 71 * Returns the value of this element. 72 * 73 * @return the value of this element 74 */ 75 @Override 76 protected ValueObject getValueObject() { 77 if (this.value == null) { 78 throw new IllegalArgumentException("Variable name is not set"); 79 } 80 return this.value; 81 } 82} 83